scripts: Make workflow of test_plan.py script more robust

The script was not resolving all detected changes uniformly:
find_excludes() could skip or not certain patterns based on
required testing scope. The idea was to not include files
that were already handled by find_test() and find_boards() workflows.
However, only boards and tests folders could be removed but
not samples. This also led to blind spots: changes in some files
were not triggering any tests. E.g. change in a test/common, where
no corresponding yaml can be found by find_tests() which is also
ignored by find_excludes(). In the new workflow a list of resolved
files (for which find_arch(), find_tests() or find_boards()
found scope) is created. Instead of using skip in find_excludes,
files are excluded only if they were resolved.

Signed-off-by: Maciej Perkowski <Maciej.Perkowski@nordicsemi.no>

scripts/ci/test_plan.py

@@ -97,13 +97,13 @@ class Filters:
                  pull_request=False, platforms=[], detailed_test_id=True):
         self.modified_files = modified_files
         self.testsuite_root = testsuite_root
+        self.resolved_files = []
         self.twister_options = []
         self.full_twister = False
         self.all_tests = []
         self.tag_options = []
         self.pull_request = pull_request
         self.platforms = platforms
-        self.default_run = False
         self.detailed_test_id = detailed_test_id
         self.ignore_path = ignore_path
         self.tag_cfg_file = alt_tags
@@ -115,11 +115,7 @@ class Filters:
         if not self.platforms:
             self.find_archs()
             self.find_boards()
-
+        self.find_excludes()
-        if self.default_run:
-            self.find_excludes(skip=["tests/*", "boards/*/*/*"])
-        else:
-            self.find_excludes()
 
     def get_plan(self, options, integration=False, use_testsuite_root=True):
         fname = "_test_plan_partial.json"
@@ -200,6 +196,8 @@ class Filters:
                         archs.add('riscv64')
                     else:
                         archs.add(p.group(1))
+                    # Modified file is treated as resolved, since a matching scope was found
+                    self.resolved_files.append(f)
 
         _options = []
         for arch in archs:
@@ -218,6 +216,7 @@ class Filters:
     def find_boards(self):
         boards = set()
         all_boards = set()
+        resolved = []
 
         for f in self.modified_files:
             if f.endswith(".rst") or f.endswith(".png") or f.endswith(".jpg"):
@@ -225,6 +224,7 @@ class Filters:
             p = re.match(r"^boards\/[^/]+\/([^/]+)\/", f)
             if p and p.groups():
                 boards.add(p.group(1))
+                resolved.append(f)
 
         roots = [zephyr_base]
         if repository_path != zephyr_base:
@@ -239,10 +239,16 @@ class Filters:
                 if name_re.search(kb.name):
                     all_boards.add(kb.name)
 
+        # If modified file is catched by "find_boards" workflow (change in "boards" dir AND board recognized)
+        # it means a proper testing scope for this file was found and this file can be removed
+        # from further consideration
+        for board in all_boards:
+            self.resolved_files.extend(list(filter(lambda f: board in f, resolved)))
+
         _options = []
         if len(all_boards) > 20:
             logging.warning(f"{len(boards)} boards changed, this looks like a global change, skipping test handling, revert to default.")
-            self.default_run = True
+            self.full_twister = True
             return
 
         for board in all_boards:
@@ -262,6 +268,8 @@ class Filters:
                 if os.path.exists(os.path.join(d, "testcase.yaml")) or \
                     os.path.exists(os.path.join(d, "sample.yaml")):
                     tests.add(d)
+                    # Modified file is treated as resolved, since a matching scope was found
+                    self.resolved_files.append(f)
                     break
                 else:
                     d = os.path.dirname(d)
@@ -272,7 +280,7 @@ class Filters:
 
         if len(tests) > 20:
             logging.warning(f"{len(tests)} tests changed, this looks like a global change, skipping test handling, revert to default")
-            self.default_run = True
+            self.full_twister = True
             return
 
         if _options:
@@ -328,21 +336,22 @@ class Filters:
             ignores = filter(lambda x: not x.startswith("#"), ignores)
 
         found = set()
-        files = list(filter(lambda x: x, self.modified_files))
+        files_not_resolved = list(filter(lambda x: x not in self.resolved_files, self.modified_files))
 
         for pattern in ignores:
-            if pattern in skip:
-                continue
             if pattern:
-                found.update(fnmatch.filter(files, pattern))
+                found.update(fnmatch.filter(files_not_resolved, pattern))
 
         logging.debug(found)
-        logging.debug(files)
+        logging.debug(files_not_resolved)
 
-        if sorted(files) != sorted(found):
+        # Full twister run can be ordered by detecting great number of tests/boards changed
+        # or if not all modified files were resolved (corresponding scope found)
+        self.full_twister = self.full_twister or sorted(files_not_resolved) != sorted(found)
+
+        if self.full_twister:
             _options = []
             logging.info(f'Need to run full or partial twister...')
-            self.full_twister = True
             if self.platforms:
                 for platform in self.platforms:
                     _options.extend(["-p", platform])

scripts/ci/twister_ignore.txt

@@ -17,25 +17,6 @@ CODEOWNERS
 MAINTAINERS.yml
 LICENSE
 Makefile
-tests/*
-samples/*
-boards/*/*/*
-arch/xtensa/*
-arch/x86/*
-arch/posix/*
-arch/arc/*
-arch/sparc/*
-arch/arm/*
-arch/nios2/*
-arch/riscv/*
-include/arch/xtensa/*
-include/arch/x86/*
-include/arch/posix/*
-include/arch/arc/*
-include/arch/sparc/*
-include/arch/arm/*
-include/arch/nios2/*
-include/arch/riscv/*
 doc/*
 # GH action have no impact on code
 .github/*